Influence and Optimization of Shielding Fitting on Voltage Distribution of Series Multi-break Mechanical Switch of Hybrid Circuit Breaker

doi:10.3969/j.issn.1008-0198.2022.04.001

Abstract

Abstract: In order to study the influence of shielding fitting on the voltage distribution of series multi-break mechanical switch of hybrid DC circuit breaker, and provide support for the voltage sharing design of fast series multi-break mechanical switch of hybrid HVDC circuit breaker, a typical ±200 kV hybrid DC circuit breaker model is established in this paper. The influence of the power electronic module, the energy absorption module and the shielding fitting on the voltage distribution characteristics of the break of the fast mechanical switch is analyzed by using the electrostatic field simulation, especially the influence of the structural parameters and arrangement of the shielding fitting on the voltage distribution characteristics of the break. The results show that the shielding fitting has the greatest influence on the voltage distribution between the breaks, the voltage distribution between the breaks can be effectively improved by means of the completely enclosed structure of the top layer shield, and reduce the distance between the top layer shield and the fast mechanical switching unit. Based on the simulation results, the structure parameters and arrangement mode of ±200 kV hybrid shielding DC circuit breaker fitting are optimized, the optimized voltage percentage of the high voltage side break decreases from 59.97% to 52.32% and it shows the effectiveness of the optimization measures. The results of this paper can provide a reference for the design of voltage sharing design of series multi-break mechanical switches for hybrid DC circuit breakers.

Key words: hybrid DC circuit breaker, series multi-break mechanical switch, voltage sharing design, structural optimization, shielding fitting

CLC Number:

TM561

WANG Huaqing, HUANG Daochun, SHUANG Mingjing, Li Huipeng, CHEN Xin, QIU Yiqun. Influence and Optimization of Shielding Fitting on Voltage Distribution of Series Multi-break Mechanical Switch of Hybrid Circuit Breaker[J]. Hunan Electric Power, 2022, 42(4): 1-6.

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